Motor driving circuit

Abstract

A motor driving circuit includes a first output switch, a second output switch, a first adjusting module, and a second adjusting module. A rising slew rate of the first output current along the first direction is adjusted according to the first adjusting parameter of the first adjusting module. A falling slew rate of the first output current along the first direction is adjusted according to the second adjusting parameter of the second adjusting module.

What is claimed is: 
     
       1. A motor driving circuit, including an output end for outputting a first output current along a first direction and a second output current along a second direction to drive a motor, the motor driving circuit comprising: a driving module providing a switching driving signal; a first output switch including a first end, a second end and a third end, the first end of the first output switch being electrically connected to a first reference voltage, the third end of the first output switch being electrically connected to the output end of the motor driving circuit, wherein the second end of the first output switch receives a switching driving signal of the driving module;
 a second output switch including a first end, a second end and a third end, the first end of the second output switch being electrically connected to the third end of the first output switch and the output end of the motor driving circuit, the third end of the second output switch being electrically connected to a second reference voltage, wherein the second end of the second output switch receives the switching driving signal of the driving module; 
 a first adjusting module including a first adjusting end and a second adjusting end, the first adjusting end of the first adjusting module being electrically connected to the second end of the first output switch, the second adjusting end of the first adjusting module being electrically connected to the output end of the motor driving circuit, wherein the first adjusting module has a first adjusting parameter; and 
 a second adjusting module including a first adjusting end and a second adjusting end, the first adjusting end being electrically connected to the second end of the first output switch, the second adjusting end of the second adjusting module being electrically connected to the output end of the motor driving circuit, wherein the second adjusting module has a second adjusting parameter; 
 wherein a rising slew rate of the first output current along the first direction is adjusted according to the first adjusting parameter of the first adjusting module, a falling slew rate of the first output current along the first direction is adjusted according to the second adjusting parameter of the second adjusting module; 
 wherein the first adjusting module includes: a first current mirror unit, including: 
 a first current mirror switch having a first end, a second end and a third end, the first end of the first current mirror switch being electrically connected to a third reference voltage; and a second current mirror switch having a first end, a second end and a third end, the first end of the second current mirror switch being electrically connected to the third reference voltage; and a first adjusting unit, including: 
 a first adjusting capacitor having a first end and a second end; a first adjusting switch having a first end, a second end and a third end; and 
 a second adjusting switch having a first end, a second end and a third end, wherein the third end of the first adjusting switch and the third end of the second adjusting switch are electrically connected to a fourth reference voltage; 
 wherein the second end of the first current mirror switch is electrically connected to the second end and the third end of the second current mirror switch, the third end of the first current mirror switch is electrically connected to the first adjusting end of the first adjusting module, the third end of the second current mirror switch is electrically connected to the first end of the second adjusting switch, the first end of the first adjusting switch is electrically connected to the second end of the second adjusting switch, the first end of the first adjusting switch is electrically connected to the second end of the first adjusting capacitor, and the first end of the first adjusting capacitor is electrically connected to the second adjusting end of the first adjusting module. 
 
     
     
       2. The motor driving circuit of  claim 1 , wherein the first adjusting module and the second adjusting module adjust a voltage of the second end of the first output switch based on the first output current along the first direction for adjusting the rising slew rate or the falling slew rate of the first output current. 
     
     
       3. The motor driving circuit of  claim 1 , wherein a linear adjustment of the rising slew rate of the first output current along the first direction is adjusted based on the first adjusting parameter of the first adjusting module, and a linear adjustment of the falling slew rate of the first output current along the first direction is adjusted based on the second adjusting parameter of the second adjusting module. 
     
     
       4. The motor driving circuit of  claim 3 , wherein the first adjusting parameter is determined based on a first adjusting current flowing through the first adjusting switch of the first adjusting module and a capacitance of the first adjusting capacitor. 
     
     
       5. The motor driving circuit of  claim 2 , wherein the second adjusting module includes:
 a second current mirror unit, including:
 a first current mirror switch having a first end, a second end and a third end, the third end of the first current mirror switch being electrically connected to a sixth reference voltage; and 
 a second current mirror switch having a first end, a second end and a third end, the third end of the second current mirror switch being electrically connected to the sixth reference voltage; and 
 
 a second adjusting unit, including:
 a second adjusting capacitor having a first end and a second end; 
 a first adjusting switch having a first end, a second end and a third end; and 
 a second adjusting switch having a first end, a second end and a third end, wherein the first end of the first adjusting switch and the first end of the second adjusting switch are electrically connected to a fifth reference voltage; 
 
 wherein the second end of the first current mirror switch is electrically connected to the second end and the first end of the second current mirror switch, the first end of the first current mirror switch is electrically connected to the first adjusting end of the second adjusting module, the first end of the second current mirror switch is electrically connected to the third end of the second adjusting switch, the third end of the first adjusting switch is electrically connected to the second end of the second adjusting switch, the second end of the first adjusting switch is electrically connected to a second bias voltage, the third end of the first adjusting switch is electrically connected to the first end of the second adjusting capacitor, and the second end of the second adjusting capacitor is electrically connected to the second adjusting end of the second adjusting module. 
 
     
     
       6. The motor driving circuit of  claim 4 , wherein the second adjusting parameter is determined based on a second adjusting current flowing through the first adjusting switch of the second adjusting module and a capacitance of the second adjusting capacitor. 
     
     
       7. The motor driving circuit of  claim 1 , further comprising:
 a third adjusting module, including a first adjusting end and a second adjusting end, the first adjusting end of the third adjusting module being electrically connected to the second end of the second output switch, the second adjusting end of the third adjusting module being electrically connected to the output end of the motor driving circuit, wherein the third adjusting module has a third adjusting parameter; and 
 a fourth adjusting module including a first adjusting end and a second adjusting end, the first adjusting end of the fourth adjusting module being electrically connected to the second end of the second output switch, the second adjusting end of the fourth adjusting module being electrically connected to the output end of the motor driving circuit, wherein the fourth adjusting module has a fourth adjusting parameter; 
 wherein a rising slew rate of the first output current along a second direction is adjusted based on the third adjusting parameter, a falling slew rate of the first output current along the second direction is adjusted based on the fourth adjusting parameter. 
 
     
     
       8. The motor driving circuit of  claim 7 , wherein the third adjusting module and the fourth adjusting module adjust a voltage of the second end of the second output switch based on the second output current along the second direction for adjusting the rising slew rate or the falling slew rate of the second output current. 
     
     
       9. The motor driving circuit of  claim 7 , wherein a linear adjustment of the rising slew rate of the second output current along the second direction is adjusted based on the third adjusting parameter, a linear adjustment of the falling slew rate of the second output current along the second direction is adjusted based on the fourth parameter of the fourth adjusting module. 
     
     
       10. The motor driving circuit of  claim 7 , wherein the third adjusting module includes:
 a third current mirror unit, including:
 a first current mirror switch having a first end, a second end and a third end, the first end of the first current mirror switch being electrically connected to a seventh reference voltage; and 
 a second current mirror switch having a first end, a second end and a third end, the first end of the second current mirror switch being electrically connected to the seventh reference voltage; and 
 
 a third adjusting unit, including:
 a third adjusting capacitor having a first end and a second end; 
 a first adjusting switch having a first end, a second end and a third end; and 
 a second adjusting switch having a first end, a second end and a third end, wherein the third end of the first adjusting switch and the third end of the second adjusting switch are electrically connected to an eighth reference voltage; 
 
 wherein the second end of the first current mirror switch is electrically connected to the second end and the third end of the second current mirror switch, the third end of the first current mirror switch is electrically connected to the first adjusting end of the third adjusting module, the third end of the second current mirror switch is electrically connected to the first end of the second adjusting switch, the first end of the first adjusting switch is electrically connected to the second end of the second adjusting switch, the second end of the first adjusting switch is electrically connected to a third reference voltage, the first end of the first adjusting switch is electrically connected to the second end of the third adjusting capacitor, and the first end of the third adjusting capacitor is electrically connected to the second adjusting end of the third adjusting module. 
 
     
     
       11. The motor driving circuit of  claim 10 , wherein the fourth adjusting module includes:
 a fourth current mirror unit, including:
 a first current mirror switch having a first end, a second end and a third end, the third end of the first current mirror switch being electrically connected to a tenth reference voltage; and 
 a second current mirror switch having a first end, a second end and a third end, the third end of the second current mirror switch being electrically connected to the tenth reference voltage; and 
 
 a fourth adjusting unit, including:
 a fourth adjusting capacitor having a first end and a second end; 
 a first adjusting switch having a first end, a second end and a third end; and 
 a second adjusting switch having a first end, a second end and a third end, 
 
 wherein the first end of the first adjusting switch and the first end of the second adjusting switch are electrically connected to a ninth reference voltage; 
 wherein the second end of the first current mirror switch is electrically connected to the second end and the first end of the second current mirror switch, the first end of the first current mirror switch is electrically connected to the first adjusting end of the fourth adjusting module, the first end of the second current mirror switch is electrically connected to the third end of the second adjusting switch, the third end of the first adjusting switch is electrically connected to the second end of the second adjusting switch, the second end of the first adjusting switch is electrically connected to a fourth bias voltage, the third end of the first adjusting switch is electrically connected to the first end of the fourth adjusting capacitor, and the second end of the fourth adjusting capacitor is electrically connected to the second adjusting end of the fourth adjusting module. 
 
     
     
       12. The motor driving circuit of  claim 1 , further comprising:
 a control module generating a control signal based on a system control signal; and 
 a pulse width modulation signal generating module electrically connected to the control module and the driving module, generating a pulse width modulation signal based on the control signal, and transmitting the pulse width modulation signal to the driving module for driving the first output switch and the second output switch. 
 
     
     
       13. The motor driving circuit of  claim 11 , wherein the driving module includes:
 a first driving unit; and 
 a second driving unit, wherein the first driving unit is electrically connected to the second end of the first output switch, and the second driving unit is electrically connected to the second end of the second output switch. 
 
     
     
       14. A motor driving circuit, including an output end for outputting a first output current along a first direction and a second output current along a second direction to drive a motor, the motor driving circuit comprising: a driving module providing a switching driving signal;
 a first output switch including a first end, a second end and a third end, the first end of the first output switch being electrically connected to a first reference voltage, the third end of the first output switch being electrically connected to the output end of the motor driving circuit, wherein the second end of the first output switch receives a switching driving signal of the driving module; a second output switch including a first end, a second end and a third end, the first end of the second output switch being electrically connected to the third end of the first output switch and the output end of the motor driving circuit, the third end of the second output switch being electrically connected to a second reference voltage, wherein the second end of the second output switch receives the switching driving signal of the driving module; a first adjusting module including a first adjusting end and a second adjusting end, the first adjusting end of the first adjusting module being electrically connected to the second end of the first output switch, the second adjusting end of the first adjusting module being electrically connected to the output end of the motor driving circuit, wherein the first adjusting module has a first adjusting parameter; and 
 a second adjusting module including a first adjusting end and a second adjusting end, the first adjusting end being electrically connected to the second end of the first output switch, the second adjusting end of the second adjusting module being electrically connected to the output end of the motor driving circuit, wherein the second adjusting module has a second adjusting parameter; a third adjusting module including a first adjusting end and a second adjusting end, the first adjusting end of the third adjusting module being electrically connected to the second end of the second output switch, the second adjusting end of the third adjusting module being electrically connected to the output end of the motor driving circuit, wherein the third adjusting module has a third adjusting parameter; and 
 a fourth adjusting module including a first adjusting end and a second adjusting end, the first adjusting end of the fourth adjusting module being electrically connected to the second end of the second output switch, the second adjusting end of the fourth adjusting module being electrically connected to the output end of the motor driving circuit, wherein the fourth adjusting module has a fourth adjusting parameter; 
 wherein a rising slew rate of the first output current along the first direction is adjusted according to the first adjusting parameter of the first adjusting module, a falling slew rate of the first output current along the first direction is adjusted according to the second adjusting parameter of the second adjusting module, a rising slew rate of the second output current along the second direction is adjusted according to third adjusting parameter, and a falling slew rate of the second output current along the second direction is adjusted according to the fourth adjusting parameter; 
 wherein the first adjusting module includes: a first current mirror unit, including: 
 a first current mirror switch having a first end, a second end and a third end, the first end of the first current mirror switch being electrically connected to a third reference voltage; and a second current mirror switch having a first end, a second end and a third end, the first end of the second current mirror switch being electrically connected to the third reference voltage; and a first adjusting unit, including: 
 a first adjusting capacitor having a first end and a second end; a first adjusting switch having a first end, a second end and a third end; and 
 a second adjusting switch having a first end, a second end and a third end, wherein the third end of the first adjusting switch and the third end of the second adjusting switch are electrically connected to a fourth reference voltage; 
 wherein the second end of the first current mirror switch is electrically connected to the second end and the third end of the second current mirror switch, the third end of the first current mirror switch is electrically connected to the first adjusting end of the first adjusting module, the third end of the second current mirror switch is electrically connected to the first end of the second adjusting switch, the first end of the first adjusting switch is electrically connected to the second end of the second adjusting switch, the first end of the first adjusting switch is electrically connected to the second end of the first adjusting capacitor, and the first end of the first adjusting capacitor is electrically connected to the second adjusting end of the first adjusting module.